RNMA120400-RK5 WKK20S Wendeplatten - Walter Tools

Take advantage of a proven combination of Tiger·tec Silver coating and the WKK20S grade for reliable cast-iron machining; the RK5 chipbreaker ensures controlled chip formation and consistent tool life. Order directly via Metav Werkzeuge or consult their specialists for application-specific advice.

RNMA120400-RK5 WKK20S round indexable insert, Tiger·tec Silver (for cast iron) — Walter Tools

RNMA120400-RK5 WKK20S is a round indexable turning insert designed for efficient and secure removal of material from cast-iron components in production environments

• Tiger·tec Silver coating for long tool life
• Optimised for cast iron (ISO K)
• RK5 chipbreaker for secure chip control
• Round geometry for versatile profiling

Secure chip control for continuous production

The round insert is engineered to deliver consistent chip control through its RK5 chipbreaker, which stabilises the cutting process when machining cast-iron materials. Short, brittle chips typical of grey and nodular cast irons are broken reliably, reducing interruptions due to chip jamming. As a consequence, cycle times are stabilised and machine downtimes are reduced, which supports predictable production planning and higher overall equipment effectiveness. The design also favours safe chip evacuation in both stable and moderate-depth cuts, improving process reliability.

Durable cutting performance with advanced coating technology

The grade WKK20S, implemented in the Tiger·tec Silver coating system, combines a coated carbide substrate with a tailored surface treatment to withstand abrasive wear often encountered on cast-iron workpieces. The coating reduces flank wear and helps maintain a sharp cutting edge under typical interrupted-cut conditions, which results in a longer usable life of the insert and fewer index changes. The 0° negative rake configuration contributes to edge robustness, enabling secure edge retention when facing tough machining tasks and consequently supporting consistent surface finish quality.

Versatile geometry and predictable handling in the toolroom

The round geometry and small corner radius of the insert allow flexible profiling and simplified tool setup for axial and radial approach variants. The insert’s format ensures repeatable clamping and predictable engagement, which is beneficial for short-run production as well as higher-volume series work. Tolerance class M supports reproducible seating and interchangeability in standard toolholders. Overall, the combination of geometry, coating and chip control is designed to provide process stability, improved uptime and fewer tool changes, supporting a smoother workflow in the turning cell.

For tailored recommendations on applying Walter Tools Tiger·tec Silver inserts in specific cast-iron machining operations, contact Metav Werkzeuge by e‑mail at info@metav-werkzeuge.com or by phone at +49 2822 7131930 for application support and availability

Technical data

• Article number: RNMA120400-RK5-WKK20S-WALTER
• Designation: RNMA120400-RK5 WKK20S
• Product type: Indexable turning insert (round)
• Brand: Walter Tools
• Series: Tiger·tec Silver

Core figures

• Insert size: 12
• Thickness: 04
• Corner radius: 0
• Rake angle: 0° (negative)
• Tolerance class: M
• Execution: A

Special features

• Grade: WKK20S (coated carbide)
• Chipbreaker: RK5
• Suitable for: cast iron (ISO K)
• Shape: round
• Series description: Tiger·tec Silver technology for improved wear resistance and edge stability

FAQ

What materials is this insert intended for?
This insert is optimised for machining cast iron (ISO group K); the WKK20S grade and Tiger·tec Silver coating are selected for abrasive wear resistance on cast-iron workpieces.

How does the RK5 chipbreaker improve machining?
The RK5 chipbreaker on the RNMA120400-RK5 WKK20S insert controls chip form and breakage, reducing the risk of long, stringy chips and improving process security during interrupted or continuous cuts.

Does the 0° negative rake affect edge strength?
Yes, the 0° negative rake increases edge robustness and is beneficial for heavy or interrupted cuts; the geometry is intended to maintain a stable cutting edge under demanding conditions.

Is this insert compatible with standard toolholders for round inserts?
The insert is supplied in a standard round format with tolerance class M, enabling reproducible seating and compatibility with appropriate toolholders designed for RNMA-style round inserts.

What advantages does the Tiger·tec Silver series provide?
Tiger·tec Silver provides a coated-carbide solution that enhances wear resistance and tool life in abrasive applications, contributing to fewer index operations and more consistent productivity.

Manufacturer/Responsible: Walter Deutschland GmbH, Derendinger Straße 53, 72072 Tübingen

Protected trademarks and trade names are the property of their respective owners. Brand names and registered trademarks are mentioned for explanatory purposes only. There is no affiliation or partnership between our company and the brands referenced. The offered item is original, factory-new merchandise of the manufacturer, Walter Tools.